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Beneficiaries Equity of the Parent Company (Details Textuals) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 0 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2015 | Mar. 31, 2014 | Dec. 31, 2014 | Apr. 15, 2015 | Nov. 05, 2013 | Apr. 06, 2015 | Mar. 11, 2015
Class of Stock [Line Items] |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | 1,535,102 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount | 1,763,739 us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount |  |  |  |  |
Distributions payable | $ 29,038 us-gaap_DividendsPayableCurrentAndNoncurrent |  | $ 28,871 us-gaap_DividendsPayableCurrentAndNoncurrent |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 6.90%us-gaap_PreferredStockDividendRatePercentage |  | 6.90%us-gaap_PreferredStockDividendRatePercentage |  |  |  |
Dividends, Preferred Stock, Cash | 1,725 us-gaap_DividendsPreferredStockCash | 1,725 us-gaap_DividendsPreferredStockCash |  |  |  |  |
Series E Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 6.90%us-gaap_PreferredStockDividendRatePercentage / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |  |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ 25.00 us-gaap_PreferredStockLiquidationPreference / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |  |  |  |  |  |
Offering Program [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares Authorized For Equity Offering Program |  |  |  |  | 16,000,000 bdn_SharesAuthorizedForEquityOfferingProgram / us-gaap_StatementClassOfStockAxis = bdn_OfferingProgramMember |  |
Remaining Shares Available For Sales | 16,000,000 bdn_RemainingSharesAvailableForSales / us-gaap_StatementClassOfStockAxis = bdn_OfferingProgramMember |  |  |  |  |  |
BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Distributions payable | 29,038 us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  | 28,871 us-gaap_DividendsPayableCurrentAndNoncurrent / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |
Preferred Stock, Dividend Rate, Percentage | 6.90%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  | 6.90%us-gaap_PreferredStockDividendRatePercentage / dei_LegalEntityAxis = us-gaap_SubsidiariesMember |  |  |  |
Dividend Paid [Member] | Subsequent Event [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Distributions payable |  |  |  |  |  | 27,300 us-gaap_DividendsPayableCurrentAndNoncurrent / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Dividend Paid [Member] | Subsequent Event [Member] | Series E Preferred Stock [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends, Preferred Stock, Cash |  |  |  | 1,700 us-gaap_DividendsPreferredStockCash / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |  |  |
Dividend Paid [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. | Subsequent Event [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Distributions payable |  |  |  |  |  | $ 27,300 us-gaap_DividendsPayableCurrentAndNoncurrent / us-gaap_DividendsAxis = us-gaap_DividendPaidMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember |
Dividend Declared [Member] | BRANDYWINE OPERATING PARTNERSHIP, L.P. |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Dividends Payable, Amount Per Share |  |  |  |  |  |  | $ 0.15 us-gaap_DividendsPayableAmountPerShare / us-gaap_DividendsAxis = us-gaap_DividendDeclaredMember / dei_LegalEntityAxis = us-gaap_SubsidiariesMember
Maximum [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Fees and Commissions Percentage | 2.00%bdn_FeesandCommissionsPercentage / us-gaap_RangeAxis = us-gaap_MaximumMember |  |  |  |  |  |

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